RMS what PSI are yuou running in your Pirelli's? I have the 08 FX2 Supercrew and I have no idea what they are suppose to be at? Anyone? I found one at 45 and one at 40 and the rest at 38? I just bought the truck yesterday.

 

Just one thing to consider... The less flex the tire does when going down the road, the less rolling resistance. This equates to better gas mileage. When I got my '99 the tires were filled to 35psi. They howled going down the road (mud grips grabbing the asphault) and I got about 12mpg. I air'd them up to max sidewall of 50psi and not only do they not make the noise anymore, but I also went up to around 14mpg.

 

I ran my 275/65/20 goodyear ats at 50 and no wear trouble at all.

Scared is mounting a split rim style and inflating it to 100.I do school bus tires all day long 11x22.5's at 110 lbs.

 

My tires are not E range, the stockers are C and the Nittos are D. Both of which are wearing about as good as you can get.

My boss has E range Nittos on his 2500HD (Duramax) as does another one of my buddies (6.0L). I know that my bosses truck has 60psi up front and 45 in the rear (I just checked them the other day) this is for the winter since he is never hauling or towing, in the summer I believe that he pumps them up to 65-70 in both front and rear. The tires are wearing great over 15000 miles and they look very good.

My buddy is running something like 50 front and 40 rear in his truck he never, ever hauls or tows anything bigger than his wheeler. He only has 3-4000 miles on his tires so I don't know how they are wearing.

 

Good to know, thanks PHS. I run my E rated tires at about 50 psi now, front and closer to 45 in the rear. I was just seeing what everyone else was getting from theirs.

 

Wow, thanks for all the input guys! I tried running my tires at 55, 45 & 40 psi while out driving today, and I gotta say that 40 psi felt the best to me out of them all. I think it feeling better at 40 instead of 45 psi might have something to do with my 20" wheels, but I can DEFINITELY say there was a noticeable difference.

Again, thanks for all the input! Pics soon to follow! (As soon as it stops raining here!)

 

Dian: be careful running at 40 psi. If your tires are E rated, 40 psi may cause some odd tire wear. Just keep an eye on em.